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    <head>
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        <div id="div1">
            <p id="p1">这是一个段落。</p>
            <p id="p2">这是另一个段落。</p>
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        <script>
            var para = document.createElement("p");
            var node = document.createTextNode("这是新段落。");
            para.appendChild(node);
            var element = document.getElementById("div1");
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